When the serpent becomes his prey (Kore and Kin have fought)
Friends will become enemies
And love will fuel hate(Minmax and Complains will end up fighting, Kin will see Complains kill Minmax ("If you ever found those gobins, it will end badly for both of you" BOTH of you!), and also remember how the GAP didn't manage to save Kin, so she will end up fighting the GAP. Forgath will see this, remember the goblins were nice, as per one of the earliest comics, and fight Kin.

It fits.

The only thing not spot on, is that Kin might just tell Forgath "they killed Minmax", but maybe she will still be unable to talk, who knows.

The first link has nothing to do with doubts and everything to do with "the serpent becomes your prey". Don't make me bring out my stabbin' fork... The second link explains why he's again willing to fight the goblins because no amount of "they're nice" balances an attempted reviving of the White Terror.

Another thing apparently only I remember: Kin's inability to speak begins and ends with the room she's currently in; do you think that's where the big reunion will be, in spite of the current page suggesting very much the opposite?